Joe Biden has been teasing the left and right along the entire summer of 2020 with his choice for VP candidate. Many people, like myself, believe that he's not actually doing the choosing. Biden's rare appearances in public just keep showing that he is not 100% cognitive and functional.
Everyone thought Warren was going to be a front runner for the VP spot but then Joe painted himself into a corner and proclaimed that the VP choice would be a Woman of Color. Kamala Harris seems to be a logical choice because of her appearances in the debates, but she does come with a lot of baggage. Baggage that, since the BLM protests, might weigh heavier than before.
Joe promised to reveal his VP pick on August 1st and as this is being written on August 11th, still nothing but rumors.